I just have been noticed by Google Search Console that there are two pages with Soft 404 errors. So I cannot be sure when the error appeared first.
When calling the URL I get a blank page with the error:
Parse error: syntax error, unexpected '/' in /var/www/…/system/ee/legacy/libraries/Functions.php(627) : eval()'d code on line 27
The strange thing is that only 2 (of about 1.500 pages with the same template) are concerned - the other ones work correct. As far as I can see in those pages there is nothing special (like php-code or using snippets).
When I close the entry I get a 404; when I reopen it the error appears again.
Already tried to clear caches (EE-caches as well as local browser-caches).
Anyone with any idea about this? Thanks in advance!
As @jelle-dijkstra suggested I tried to recreate the entry. Something strange happens: 1) I delete the old entry. 2) I create a new one (just with blablabla-text). The new one is visible in the frontend without errors (URL like template/group/entryid or also template/group/urltitle/entryid) 3) I change the entry-id in the database (via phpmyadmin in the tables exp_channel_data and exp_channel_titles). If I set it to the "old" entry-id I get the error in the frontend; if I set it to any other entry-id (like 9999) the entry is shown correctly in the frontend.
Also strange is that in the last two days 3 new Soft-404-errors for new entries occurred.